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OpenCloudOS-Kernel/fs/xfs/libxfs/xfs_dir2_node.c

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/*
* Copyright (c) 2000-2005 Silicon Graphics, Inc.
* Copyright (c) 2013 Red Hat, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_inode.h"
#include "xfs_bmap.h"
#include "xfs_dir2.h"
#include "xfs_dir2_priv.h"
#include "xfs_error.h"
#include "xfs_trace.h"
#include "xfs_trans.h"
#include "xfs_buf_item.h"
#include "xfs_cksum.h"
#include "xfs_log.h"
/*
* Function declarations.
*/
static int xfs_dir2_leafn_add(struct xfs_buf *bp, xfs_da_args_t *args,
int index);
static void xfs_dir2_leafn_rebalance(xfs_da_state_t *state,
xfs_da_state_blk_t *blk1,
xfs_da_state_blk_t *blk2);
static int xfs_dir2_leafn_remove(xfs_da_args_t *args, struct xfs_buf *bp,
int index, xfs_da_state_blk_t *dblk,
int *rval);
static int xfs_dir2_node_addname_int(xfs_da_args_t *args,
xfs_da_state_blk_t *fblk);
/*
* Check internal consistency of a leafn block.
*/
#ifdef DEBUG
#define xfs_dir3_leaf_check(dp, bp) \
do { \
if (!xfs_dir3_leafn_check((dp), (bp))) \
ASSERT(0); \
} while (0);
static bool
xfs_dir3_leafn_check(
struct xfs_inode *dp,
struct xfs_buf *bp)
{
struct xfs_dir2_leaf *leaf = bp->b_addr;
struct xfs_dir3_icleaf_hdr leafhdr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
if (leafhdr.magic == XFS_DIR3_LEAFN_MAGIC) {
struct xfs_dir3_leaf_hdr *leaf3 = bp->b_addr;
if (be64_to_cpu(leaf3->info.blkno) != bp->b_bn)
return false;
} else if (leafhdr.magic != XFS_DIR2_LEAFN_MAGIC)
return false;
return xfs_dir3_leaf_check_int(dp->i_mount, dp, &leafhdr, leaf);
}
#else
#define xfs_dir3_leaf_check(dp, bp)
#endif
static bool
xfs_dir3_free_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_dir2_free_hdr *hdr = bp->b_addr;
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
if (hdr3->magic != cpu_to_be32(XFS_DIR3_FREE_MAGIC))
return false;
if (!uuid_equal(&hdr3->uuid, &mp->m_sb.sb_meta_uuid))
return false;
if (be64_to_cpu(hdr3->blkno) != bp->b_bn)
return false;
if (!xfs_log_check_lsn(mp, be64_to_cpu(hdr3->lsn)))
return false;
} else {
if (hdr->magic != cpu_to_be32(XFS_DIR2_FREE_MAGIC))
return false;
}
/* XXX: should bounds check the xfs_dir3_icfree_hdr here */
return true;
}
static void
xfs_dir3_free_read_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
if (xfs_sb_version_hascrc(&mp->m_sb) &&
!xfs_buf_verify_cksum(bp, XFS_DIR3_FREE_CRC_OFF))
xfs_buf_ioerror(bp, -EFSBADCRC);
else if (!xfs_dir3_free_verify(bp))
xfs_buf_ioerror(bp, -EFSCORRUPTED);
if (bp->b_error)
xfs_verifier_error(bp);
}
static void
xfs_dir3_free_write_verify(
struct xfs_buf *bp)
{
struct xfs_mount *mp = bp->b_target->bt_mount;
struct xfs_buf_log_item *bip = bp->b_fspriv;
struct xfs_dir3_blk_hdr *hdr3 = bp->b_addr;
if (!xfs_dir3_free_verify(bp)) {
xfs_buf_ioerror(bp, -EFSCORRUPTED);
xfs_verifier_error(bp);
return;
}
if (!xfs_sb_version_hascrc(&mp->m_sb))
return;
if (bip)
hdr3->lsn = cpu_to_be64(bip->bli_item.li_lsn);
xfs_buf_update_cksum(bp, XFS_DIR3_FREE_CRC_OFF);
}
const struct xfs_buf_ops xfs_dir3_free_buf_ops = {
.name = "xfs_dir3_free",
.verify_read = xfs_dir3_free_read_verify,
.verify_write = xfs_dir3_free_write_verify,
};
/* Everything ok in the free block header? */
static bool
xfs_dir3_free_header_check(
struct xfs_inode *dp,
xfs_dablk_t fbno,
struct xfs_buf *bp)
{
struct xfs_mount *mp = dp->i_mount;
unsigned int firstdb;
int maxbests;
maxbests = dp->d_ops->free_max_bests(mp->m_dir_geo);
firstdb = (xfs_dir2_da_to_db(mp->m_dir_geo, fbno) -
xfs_dir2_byte_to_db(mp->m_dir_geo, XFS_DIR2_FREE_OFFSET)) *
maxbests;
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
if (be32_to_cpu(hdr3->firstdb) != firstdb)
return false;
if (be32_to_cpu(hdr3->nvalid) > maxbests)
return false;
if (be32_to_cpu(hdr3->nvalid) < be32_to_cpu(hdr3->nused))
return false;
} else {
struct xfs_dir2_free_hdr *hdr = bp->b_addr;
if (be32_to_cpu(hdr->firstdb) != firstdb)
return false;
if (be32_to_cpu(hdr->nvalid) > maxbests)
return false;
if (be32_to_cpu(hdr->nvalid) < be32_to_cpu(hdr->nused))
return false;
}
return true;
}
static int
__xfs_dir3_free_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
xfs_daddr_t mappedbno,
struct xfs_buf **bpp)
{
int err;
err = xfs_da_read_buf(tp, dp, fbno, mappedbno, bpp,
XFS_DATA_FORK, &xfs_dir3_free_buf_ops);
if (err || !*bpp)
return err;
/* Check things that we can't do in the verifier. */
if (!xfs_dir3_free_header_check(dp, fbno, *bpp)) {
xfs_buf_ioerror(*bpp, -EFSCORRUPTED);
xfs_verifier_error(*bpp);
xfs_trans_brelse(tp, *bpp);
return -EFSCORRUPTED;
}
/* try read returns without an error or *bpp if it lands in a hole */
if (tp)
xfs_trans_buf_set_type(tp, *bpp, XFS_BLFT_DIR_FREE_BUF);
return 0;
}
int
xfs_dir2_free_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
struct xfs_buf **bpp)
{
return __xfs_dir3_free_read(tp, dp, fbno, -1, bpp);
}
static int
xfs_dir2_free_try_read(
struct xfs_trans *tp,
struct xfs_inode *dp,
xfs_dablk_t fbno,
struct xfs_buf **bpp)
{
return __xfs_dir3_free_read(tp, dp, fbno, -2, bpp);
}
static int
xfs_dir3_free_get_buf(
xfs_da_args_t *args,
xfs_dir2_db_t fbno,
struct xfs_buf **bpp)
{
struct xfs_trans *tp = args->trans;
struct xfs_inode *dp = args->dp;
struct xfs_mount *mp = dp->i_mount;
struct xfs_buf *bp;
int error;
struct xfs_dir3_icfree_hdr hdr;
error = xfs_da_get_buf(tp, dp, xfs_dir2_db_to_da(args->geo, fbno),
-1, &bp, XFS_DATA_FORK);
if (error)
return error;
xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DIR_FREE_BUF);
bp->b_ops = &xfs_dir3_free_buf_ops;
/*
* Initialize the new block to be empty, and remember
* its first slot as our empty slot.
*/
memset(bp->b_addr, 0, sizeof(struct xfs_dir3_free_hdr));
memset(&hdr, 0, sizeof(hdr));
if (xfs_sb_version_hascrc(&mp->m_sb)) {
struct xfs_dir3_free_hdr *hdr3 = bp->b_addr;
hdr.magic = XFS_DIR3_FREE_MAGIC;
hdr3->hdr.blkno = cpu_to_be64(bp->b_bn);
hdr3->hdr.owner = cpu_to_be64(dp->i_ino);
uuid_copy(&hdr3->hdr.uuid, &mp->m_sb.sb_meta_uuid);
} else
hdr.magic = XFS_DIR2_FREE_MAGIC;
dp->d_ops->free_hdr_to_disk(bp->b_addr, &hdr);
*bpp = bp;
return 0;
}
/*
* Log entries from a freespace block.
*/
STATIC void
xfs_dir2_free_log_bests(
struct xfs_da_args *args,
struct xfs_buf *bp,
int first, /* first entry to log */
int last) /* last entry to log */
{
xfs_dir2_free_t *free; /* freespace structure */
__be16 *bests;
free = bp->b_addr;
bests = args->dp->d_ops->free_bests_p(free);
ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
xfs_trans_log_buf(args->trans, bp,
(uint)((char *)&bests[first] - (char *)free),
(uint)((char *)&bests[last] - (char *)free +
sizeof(bests[0]) - 1));
}
/*
* Log header from a freespace block.
*/
static void
xfs_dir2_free_log_header(
struct xfs_da_args *args,
struct xfs_buf *bp)
{
#ifdef DEBUG
xfs_dir2_free_t *free; /* freespace structure */
free = bp->b_addr;
ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
#endif
xfs_trans_log_buf(args->trans, bp, 0,
args->dp->d_ops->free_hdr_size - 1);
}
/*
* Convert a leaf-format directory to a node-format directory.
* We need to change the magic number of the leaf block, and copy
* the freespace table out of the leaf block into its own block.
*/
int /* error */
xfs_dir2_leaf_to_node(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *lbp) /* leaf buffer */
{
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
struct xfs_buf *fbp; /* freespace buffer */
xfs_dir2_db_t fdb; /* freespace block number */
xfs_dir2_free_t *free; /* freespace structure */
__be16 *from; /* pointer to freespace entry */
int i; /* leaf freespace index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
int n; /* count of live freespc ents */
xfs_dir2_data_off_t off; /* freespace entry value */
__be16 *to; /* pointer to freespace entry */
xfs_trans_t *tp; /* transaction pointer */
struct xfs_dir3_icfree_hdr freehdr;
trace_xfs_dir2_leaf_to_node(args);
dp = args->dp;
tp = args->trans;
/*
* Add a freespace block to the directory.
*/
if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fdb))) {
return error;
}
ASSERT(fdb == xfs_dir2_byte_to_db(args->geo, XFS_DIR2_FREE_OFFSET));
/*
* Get the buffer for the new freespace block.
*/
error = xfs_dir3_free_get_buf(args, fdb, &fbp);
if (error)
return error;
free = fbp->b_addr;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
leaf = lbp->b_addr;
ltp = xfs_dir2_leaf_tail_p(args->geo, leaf);
ASSERT(be32_to_cpu(ltp->bestcount) <=
(uint)dp->i_d.di_size / args->geo->blksize);
/*
* Copy freespace entries from the leaf block to the new block.
* Count active entries.
*/
from = xfs_dir2_leaf_bests_p(ltp);
to = dp->d_ops->free_bests_p(free);
for (i = n = 0; i < be32_to_cpu(ltp->bestcount); i++, from++, to++) {
if ((off = be16_to_cpu(*from)) != NULLDATAOFF)
n++;
*to = cpu_to_be16(off);
}
/*
* Now initialize the freespace block header.
*/
freehdr.nused = n;
freehdr.nvalid = be32_to_cpu(ltp->bestcount);
dp->d_ops->free_hdr_to_disk(fbp->b_addr, &freehdr);
xfs_dir2_free_log_bests(args, fbp, 0, freehdr.nvalid - 1);
xfs_dir2_free_log_header(args, fbp);
/*
* Converting the leaf to a leafnode is just a matter of changing the
* magic number and the ops. Do the change directly to the buffer as
* it's less work (and less code) than decoding the header to host
* format and back again.
*/
if (leaf->hdr.info.magic == cpu_to_be16(XFS_DIR2_LEAF1_MAGIC))
leaf->hdr.info.magic = cpu_to_be16(XFS_DIR2_LEAFN_MAGIC);
else
leaf->hdr.info.magic = cpu_to_be16(XFS_DIR3_LEAFN_MAGIC);
lbp->b_ops = &xfs_dir3_leafn_buf_ops;
xfs_trans_buf_set_type(tp, lbp, XFS_BLFT_DIR_LEAFN_BUF);
xfs_dir3_leaf_log_header(args, lbp);
xfs_dir3_leaf_check(dp, lbp);
return 0;
}
/*
* Add a leaf entry to a leaf block in a node-form directory.
* The other work necessary is done from the caller.
*/
static int /* error */
xfs_dir2_leafn_add(
struct xfs_buf *bp, /* leaf buffer */
xfs_da_args_t *args, /* operation arguments */
int index) /* insertion pt for new entry */
{
int compact; /* compacting stale leaves */
xfs_inode_t *dp; /* incore directory inode */
int highstale; /* next stale entry */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
int lfloghigh; /* high leaf entry logging */
int lfloglow; /* low leaf entry logging */
int lowstale; /* previous stale entry */
struct xfs_dir3_icleaf_hdr leafhdr;
struct xfs_dir2_leaf_entry *ents;
trace_xfs_dir2_leafn_add(args, index);
dp = args->dp;
leaf = bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
/*
* Quick check just to make sure we are not going to index
* into other peoples memory
*/
if (index < 0)
return -EFSCORRUPTED;
/*
* If there are already the maximum number of leaf entries in
* the block, if there are no stale entries it won't fit.
* Caller will do a split. If there are stale entries we'll do
* a compact.
*/
if (leafhdr.count == dp->d_ops->leaf_max_ents(args->geo)) {
if (!leafhdr.stale)
return -ENOSPC;
compact = leafhdr.stale > 1;
} else
compact = 0;
ASSERT(index == 0 || be32_to_cpu(ents[index - 1].hashval) <= args->hashval);
ASSERT(index == leafhdr.count ||
be32_to_cpu(ents[index].hashval) >= args->hashval);
if (args->op_flags & XFS_DA_OP_JUSTCHECK)
return 0;
/*
* Compact out all but one stale leaf entry. Leaves behind
* the entry closest to index.
*/
if (compact)
xfs_dir3_leaf_compact_x1(&leafhdr, ents, &index, &lowstale,
&highstale, &lfloglow, &lfloghigh);
else if (leafhdr.stale) {
/*
* Set impossible logging indices for this case.
*/
lfloglow = leafhdr.count;
lfloghigh = -1;
}
/*
* Insert the new entry, log everything.
*/
lep = xfs_dir3_leaf_find_entry(&leafhdr, ents, index, compact, lowstale,
highstale, &lfloglow, &lfloghigh);
lep->hashval = cpu_to_be32(args->hashval);
lep->address = cpu_to_be32(xfs_dir2_db_off_to_dataptr(args->geo,
args->blkno, args->index));
dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
xfs_dir3_leaf_log_header(args, bp);
xfs_dir3_leaf_log_ents(args, bp, lfloglow, lfloghigh);
xfs_dir3_leaf_check(dp, bp);
return 0;
}
#ifdef DEBUG
static void
xfs_dir2_free_hdr_check(
struct xfs_inode *dp,
struct xfs_buf *bp,
xfs_dir2_db_t db)
{
struct xfs_dir3_icfree_hdr hdr;
dp->d_ops->free_hdr_from_disk(&hdr, bp->b_addr);
ASSERT((hdr.firstdb %
dp->d_ops->free_max_bests(dp->i_mount->m_dir_geo)) == 0);
ASSERT(hdr.firstdb <= db);
ASSERT(db < hdr.firstdb + hdr.nvalid);
}
#else
#define xfs_dir2_free_hdr_check(dp, bp, db)
#endif /* DEBUG */
/*
* Return the last hash value in the leaf.
* Stale entries are ok.
*/
xfs_dahash_t /* hash value */
xfs_dir2_leafn_lasthash(
struct xfs_inode *dp,
struct xfs_buf *bp, /* leaf buffer */
int *count) /* count of entries in leaf */
{
struct xfs_dir2_leaf *leaf = bp->b_addr;
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ASSERT(leafhdr.magic == XFS_DIR2_LEAFN_MAGIC ||
leafhdr.magic == XFS_DIR3_LEAFN_MAGIC);
if (count)
*count = leafhdr.count;
if (!leafhdr.count)
return 0;
ents = dp->d_ops->leaf_ents_p(leaf);
return be32_to_cpu(ents[leafhdr.count - 1].hashval);
}
/*
* Look up a leaf entry for space to add a name in a node-format leaf block.
* The extrablk in state is a freespace block.
*/
STATIC int
xfs_dir2_leafn_lookup_for_addname(
struct xfs_buf *bp, /* leaf buffer */
xfs_da_args_t *args, /* operation arguments */
int *indexp, /* out: leaf entry index */
xfs_da_state_t *state) /* state to fill in */
{
struct xfs_buf *curbp = NULL; /* current data/free buffer */
xfs_dir2_db_t curdb = -1; /* current data block number */
xfs_dir2_db_t curfdb = -1; /* current free block number */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
int fi; /* free entry index */
xfs_dir2_free_t *free = NULL; /* free block structure */
int index; /* leaf entry index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int length; /* length of new data entry */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
xfs_mount_t *mp; /* filesystem mount point */
xfs_dir2_db_t newdb; /* new data block number */
xfs_dir2_db_t newfdb; /* new free block number */
xfs_trans_t *tp; /* transaction pointer */
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
leaf = bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
xfs_dir3_leaf_check(dp, bp);
ASSERT(leafhdr.count > 0);
/*
* Look up the hash value in the leaf entries.
*/
index = xfs_dir2_leaf_search_hash(args, bp);
/*
* Do we have a buffer coming in?
*/
if (state->extravalid) {
/* If so, it's a free block buffer, get the block number. */
curbp = state->extrablk.bp;
curfdb = state->extrablk.blkno;
free = curbp->b_addr;
ASSERT(free->hdr.magic == cpu_to_be32(XFS_DIR2_FREE_MAGIC) ||
free->hdr.magic == cpu_to_be32(XFS_DIR3_FREE_MAGIC));
}
length = dp->d_ops->data_entsize(args->namelen);
/*
* Loop over leaf entries with the right hash value.
*/
for (lep = &ents[index];
index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
lep++, index++) {
/*
* Skip stale leaf entries.
*/
if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
continue;
/*
* Pull the data block number from the entry.
*/
newdb = xfs_dir2_dataptr_to_db(args->geo,
be32_to_cpu(lep->address));
/*
* For addname, we're looking for a place to put the new entry.
* We want to use a data block with an entry of equal
* hash value to ours if there is one with room.
*
* If this block isn't the data block we already have
* in hand, take a look at it.
*/
if (newdb != curdb) {
__be16 *bests;
curdb = newdb;
/*
* Convert the data block to the free block
* holding its freespace information.
*/
newfdb = dp->d_ops->db_to_fdb(args->geo, newdb);
/*
* If it's not the one we have in hand, read it in.
*/
if (newfdb != curfdb) {
/*
* If we had one before, drop it.
*/
if (curbp)
xfs_trans_brelse(tp, curbp);
error = xfs_dir2_free_read(tp, dp,
xfs_dir2_db_to_da(args->geo,
newfdb),
&curbp);
if (error)
return error;
free = curbp->b_addr;
xfs_dir2_free_hdr_check(dp, curbp, curdb);
}
/*
* Get the index for our entry.
*/
fi = dp->d_ops->db_to_fdindex(args->geo, curdb);
/*
* If it has room, return it.
*/
bests = dp->d_ops->free_bests_p(free);
if (unlikely(bests[fi] == cpu_to_be16(NULLDATAOFF))) {
XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int",
XFS_ERRLEVEL_LOW, mp);
if (curfdb != newfdb)
xfs_trans_brelse(tp, curbp);
return -EFSCORRUPTED;
}
curfdb = newfdb;
if (be16_to_cpu(bests[fi]) >= length)
goto out;
}
}
/* Didn't find any space */
fi = -1;
out:
ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);
if (curbp) {
/* Giving back a free block. */
state->extravalid = 1;
state->extrablk.bp = curbp;
state->extrablk.index = fi;
state->extrablk.blkno = curfdb;
/*
* Important: this magic number is not in the buffer - it's for
* buffer type information and therefore only the free/data type
* matters here, not whether CRCs are enabled or not.
*/
state->extrablk.magic = XFS_DIR2_FREE_MAGIC;
} else {
state->extravalid = 0;
}
/*
* Return the index, that will be the insertion point.
*/
*indexp = index;
return -ENOENT;
}
/*
* Look up a leaf entry in a node-format leaf block.
* The extrablk in state a data block.
*/
STATIC int
xfs_dir2_leafn_lookup_for_entry(
struct xfs_buf *bp, /* leaf buffer */
xfs_da_args_t *args, /* operation arguments */
int *indexp, /* out: leaf entry index */
xfs_da_state_t *state) /* state to fill in */
{
struct xfs_buf *curbp = NULL; /* current data/free buffer */
xfs_dir2_db_t curdb = -1; /* current data block number */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return value */
int index; /* leaf entry index */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
xfs_mount_t *mp; /* filesystem mount point */
xfs_dir2_db_t newdb; /* new data block number */
xfs_trans_t *tp; /* transaction pointer */
enum xfs_dacmp cmp; /* comparison result */
struct xfs_dir2_leaf_entry *ents;
struct xfs_dir3_icleaf_hdr leafhdr;
dp = args->dp;
tp = args->trans;
mp = dp->i_mount;
leaf = bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
xfs_dir3_leaf_check(dp, bp);
ASSERT(leafhdr.count > 0);
/*
* Look up the hash value in the leaf entries.
*/
index = xfs_dir2_leaf_search_hash(args, bp);
/*
* Do we have a buffer coming in?
*/
if (state->extravalid) {
curbp = state->extrablk.bp;
curdb = state->extrablk.blkno;
}
/*
* Loop over leaf entries with the right hash value.
*/
for (lep = &ents[index];
index < leafhdr.count && be32_to_cpu(lep->hashval) == args->hashval;
lep++, index++) {
/*
* Skip stale leaf entries.
*/
if (be32_to_cpu(lep->address) == XFS_DIR2_NULL_DATAPTR)
continue;
/*
* Pull the data block number from the entry.
*/
newdb = xfs_dir2_dataptr_to_db(args->geo,
be32_to_cpu(lep->address));
/*
* Not adding a new entry, so we really want to find
* the name given to us.
*
* If it's a different data block, go get it.
*/
if (newdb != curdb) {
/*
* If we had a block before that we aren't saving
* for a CI name, drop it
*/
if (curbp && (args->cmpresult == XFS_CMP_DIFFERENT ||
curdb != state->extrablk.blkno))
xfs_trans_brelse(tp, curbp);
/*
* If needing the block that is saved with a CI match,
* use it otherwise read in the new data block.
*/
if (args->cmpresult != XFS_CMP_DIFFERENT &&
newdb == state->extrablk.blkno) {
ASSERT(state->extravalid);
curbp = state->extrablk.bp;
} else {
error = xfs_dir3_data_read(tp, dp,
xfs_dir2_db_to_da(args->geo,
newdb),
-1, &curbp);
if (error)
return error;
}
xfs_dir3_data_check(dp, curbp);
curdb = newdb;
}
/*
* Point to the data entry.
*/
dep = (xfs_dir2_data_entry_t *)((char *)curbp->b_addr +
xfs_dir2_dataptr_to_off(args->geo,
be32_to_cpu(lep->address)));
/*
* Compare the entry and if it's an exact match, return
* EEXIST immediately. If it's the first case-insensitive
* match, store the block & inode number and continue looking.
*/
cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
/* If there is a CI match block, drop it */
if (args->cmpresult != XFS_CMP_DIFFERENT &&
curdb != state->extrablk.blkno)
xfs_trans_brelse(tp, state->extrablk.bp);
args->cmpresult = cmp;
args->inumber = be64_to_cpu(dep->inumber);
args->filetype = dp->d_ops->data_get_ftype(dep);
*indexp = index;
state->extravalid = 1;
state->extrablk.bp = curbp;
state->extrablk.blkno = curdb;
state->extrablk.index = (int)((char *)dep -
(char *)curbp->b_addr);
state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
curbp->b_ops = &xfs_dir3_data_buf_ops;
xfs_trans_buf_set_type(tp, curbp, XFS_BLFT_DIR_DATA_BUF);
if (cmp == XFS_CMP_EXACT)
return -EEXIST;
}
}
ASSERT(index == leafhdr.count || (args->op_flags & XFS_DA_OP_OKNOENT));
if (curbp) {
if (args->cmpresult == XFS_CMP_DIFFERENT) {
/* Giving back last used data block. */
state->extravalid = 1;
state->extrablk.bp = curbp;
state->extrablk.index = -1;
state->extrablk.blkno = curdb;
state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
curbp->b_ops = &xfs_dir3_data_buf_ops;
xfs_trans_buf_set_type(tp, curbp, XFS_BLFT_DIR_DATA_BUF);
} else {
/* If the curbp is not the CI match block, drop it */
if (state->extrablk.bp != curbp)
xfs_trans_brelse(tp, curbp);
}
} else {
state->extravalid = 0;
}
*indexp = index;
return -ENOENT;
}
/*
* Look up a leaf entry in a node-format leaf block.
* If this is an addname then the extrablk in state is a freespace block,
* otherwise it's a data block.
*/
int
xfs_dir2_leafn_lookup_int(
struct xfs_buf *bp, /* leaf buffer */
xfs_da_args_t *args, /* operation arguments */
int *indexp, /* out: leaf entry index */
xfs_da_state_t *state) /* state to fill in */
{
if (args->op_flags & XFS_DA_OP_ADDNAME)
return xfs_dir2_leafn_lookup_for_addname(bp, args, indexp,
state);
return xfs_dir2_leafn_lookup_for_entry(bp, args, indexp, state);
}
/*
* Move count leaf entries from source to destination leaf.
* Log entries and headers. Stale entries are preserved.
*/
static void
xfs_dir3_leafn_moveents(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *bp_s, /* source */
struct xfs_dir3_icleaf_hdr *shdr,
struct xfs_dir2_leaf_entry *sents,
int start_s,/* source leaf index */
struct xfs_buf *bp_d, /* destination */
struct xfs_dir3_icleaf_hdr *dhdr,
struct xfs_dir2_leaf_entry *dents,
int start_d,/* destination leaf index */
int count) /* count of leaves to copy */
{
int stale; /* count stale leaves copied */
trace_xfs_dir2_leafn_moveents(args, start_s, start_d, count);
/*
* Silently return if nothing to do.
*/
if (count == 0)
return;
/*
* If the destination index is not the end of the current
* destination leaf entries, open up a hole in the destination
* to hold the new entries.
*/
if (start_d < dhdr->count) {
memmove(&dents[start_d + count], &dents[start_d],
(dhdr->count - start_d) * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir3_leaf_log_ents(args, bp_d, start_d + count,
count + dhdr->count - 1);
}
/*
* If the source has stale leaves, count the ones in the copy range
* so we can update the header correctly.
*/
if (shdr->stale) {
int i; /* temp leaf index */
for (i = start_s, stale = 0; i < start_s + count; i++) {
if (sents[i].address ==
cpu_to_be32(XFS_DIR2_NULL_DATAPTR))
stale++;
}
} else
stale = 0;
/*
* Copy the leaf entries from source to destination.
*/
memcpy(&dents[start_d], &sents[start_s],
count * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir3_leaf_log_ents(args, bp_d, start_d, start_d + count - 1);
/*
* If there are source entries after the ones we copied,
* delete the ones we copied by sliding the next ones down.
*/
if (start_s + count < shdr->count) {
memmove(&sents[start_s], &sents[start_s + count],
count * sizeof(xfs_dir2_leaf_entry_t));
xfs_dir3_leaf_log_ents(args, bp_s, start_s, start_s + count - 1);
}
/*
* Update the headers and log them.
*/
shdr->count -= count;
shdr->stale -= stale;
dhdr->count += count;
dhdr->stale += stale;
}
/*
* Determine the sort order of two leaf blocks.
* Returns 1 if both are valid and leaf2 should be before leaf1, else 0.
*/
int /* sort order */
xfs_dir2_leafn_order(
struct xfs_inode *dp,
struct xfs_buf *leaf1_bp, /* leaf1 buffer */
struct xfs_buf *leaf2_bp) /* leaf2 buffer */
{
struct xfs_dir2_leaf *leaf1 = leaf1_bp->b_addr;
struct xfs_dir2_leaf *leaf2 = leaf2_bp->b_addr;
struct xfs_dir2_leaf_entry *ents1;
struct xfs_dir2_leaf_entry *ents2;
struct xfs_dir3_icleaf_hdr hdr1;
struct xfs_dir3_icleaf_hdr hdr2;
dp->d_ops->leaf_hdr_from_disk(&hdr1, leaf1);
dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf2);
ents1 = dp->d_ops->leaf_ents_p(leaf1);
ents2 = dp->d_ops->leaf_ents_p(leaf2);
if (hdr1.count > 0 && hdr2.count > 0 &&
(be32_to_cpu(ents2[0].hashval) < be32_to_cpu(ents1[0].hashval) ||
be32_to_cpu(ents2[hdr2.count - 1].hashval) <
be32_to_cpu(ents1[hdr1.count - 1].hashval)))
return 1;
return 0;
}
/*
* Rebalance leaf entries between two leaf blocks.
* This is actually only called when the second block is new,
* though the code deals with the general case.
* A new entry will be inserted in one of the blocks, and that
* entry is taken into account when balancing.
*/
static void
xfs_dir2_leafn_rebalance(
xfs_da_state_t *state, /* btree cursor */
xfs_da_state_blk_t *blk1, /* first btree block */
xfs_da_state_blk_t *blk2) /* second btree block */
{
xfs_da_args_t *args; /* operation arguments */
int count; /* count (& direction) leaves */
int isleft; /* new goes in left leaf */
xfs_dir2_leaf_t *leaf1; /* first leaf structure */
xfs_dir2_leaf_t *leaf2; /* second leaf structure */
int mid; /* midpoint leaf index */
#if defined(DEBUG) || defined(XFS_WARN)
int oldstale; /* old count of stale leaves */
#endif
int oldsum; /* old total leaf count */
int swap; /* swapped leaf blocks */
struct xfs_dir2_leaf_entry *ents1;
struct xfs_dir2_leaf_entry *ents2;
struct xfs_dir3_icleaf_hdr hdr1;
struct xfs_dir3_icleaf_hdr hdr2;
struct xfs_inode *dp = state->args->dp;
args = state->args;
/*
* If the block order is wrong, swap the arguments.
*/
if ((swap = xfs_dir2_leafn_order(dp, blk1->bp, blk2->bp))) {
xfs_da_state_blk_t *tmp; /* temp for block swap */
tmp = blk1;
blk1 = blk2;
blk2 = tmp;
}
leaf1 = blk1->bp->b_addr;
leaf2 = blk2->bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&hdr1, leaf1);
dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf2);
ents1 = dp->d_ops->leaf_ents_p(leaf1);
ents2 = dp->d_ops->leaf_ents_p(leaf2);
oldsum = hdr1.count + hdr2.count;
#if defined(DEBUG) || defined(XFS_WARN)
oldstale = hdr1.stale + hdr2.stale;
#endif
mid = oldsum >> 1;
/*
* If the old leaf count was odd then the new one will be even,
* so we need to divide the new count evenly.
*/
if (oldsum & 1) {
xfs_dahash_t midhash; /* middle entry hash value */
if (mid >= hdr1.count)
midhash = be32_to_cpu(ents2[mid - hdr1.count].hashval);
else
midhash = be32_to_cpu(ents1[mid].hashval);
isleft = args->hashval <= midhash;
}
/*
* If the old count is even then the new count is odd, so there's
* no preferred side for the new entry.
* Pick the left one.
*/
else
isleft = 1;
/*
* Calculate moved entry count. Positive means left-to-right,
* negative means right-to-left. Then move the entries.
*/
count = hdr1.count - mid + (isleft == 0);
if (count > 0)
xfs_dir3_leafn_moveents(args, blk1->bp, &hdr1, ents1,
hdr1.count - count, blk2->bp,
&hdr2, ents2, 0, count);
else if (count < 0)
xfs_dir3_leafn_moveents(args, blk2->bp, &hdr2, ents2, 0,
blk1->bp, &hdr1, ents1,
hdr1.count, count);
ASSERT(hdr1.count + hdr2.count == oldsum);
ASSERT(hdr1.stale + hdr2.stale == oldstale);
/* log the changes made when moving the entries */
dp->d_ops->leaf_hdr_to_disk(leaf1, &hdr1);
dp->d_ops->leaf_hdr_to_disk(leaf2, &hdr2);
xfs_dir3_leaf_log_header(args, blk1->bp);
xfs_dir3_leaf_log_header(args, blk2->bp);
xfs_dir3_leaf_check(dp, blk1->bp);
xfs_dir3_leaf_check(dp, blk2->bp);
/*
* Mark whether we're inserting into the old or new leaf.
*/
if (hdr1.count < hdr2.count)
state->inleaf = swap;
else if (hdr1.count > hdr2.count)
state->inleaf = !swap;
else
state->inleaf = swap ^ (blk1->index <= hdr1.count);
/*
* Adjust the expected index for insertion.
*/
if (!state->inleaf)
blk2->index = blk1->index - hdr1.count;
/*
* Finally sanity check just to make sure we are not returning a
* negative index
*/
if (blk2->index < 0) {
state->inleaf = 1;
blk2->index = 0;
xfs_alert(dp->i_mount,
"%s: picked the wrong leaf? reverting original leaf: blk1->index %d",
__func__, blk1->index);
}
}
static int
xfs_dir3_data_block_free(
xfs_da_args_t *args,
struct xfs_dir2_data_hdr *hdr,
struct xfs_dir2_free *free,
xfs_dir2_db_t fdb,
int findex,
struct xfs_buf *fbp,
int longest)
{
int logfree = 0;
__be16 *bests;
struct xfs_dir3_icfree_hdr freehdr;
struct xfs_inode *dp = args->dp;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
bests = dp->d_ops->free_bests_p(free);
if (hdr) {
/*
* Data block is not empty, just set the free entry to the new
* value.
*/
bests[findex] = cpu_to_be16(longest);
xfs_dir2_free_log_bests(args, fbp, findex, findex);
return 0;
}
/* One less used entry in the free table. */
freehdr.nused--;
/*
* If this was the last entry in the table, we can trim the table size
* back. There might be other entries at the end referring to
* non-existent data blocks, get those too.
*/
if (findex == freehdr.nvalid - 1) {
int i; /* free entry index */
for (i = findex - 1; i >= 0; i--) {
if (bests[i] != cpu_to_be16(NULLDATAOFF))
break;
}
freehdr.nvalid = i + 1;
logfree = 0;
} else {
/* Not the last entry, just punch it out. */
bests[findex] = cpu_to_be16(NULLDATAOFF);
logfree = 1;
}
dp->d_ops->free_hdr_to_disk(free, &freehdr);
xfs_dir2_free_log_header(args, fbp);
/*
* If there are no useful entries left in the block, get rid of the
* block if we can.
*/
if (!freehdr.nused) {
int error;
error = xfs_dir2_shrink_inode(args, fdb, fbp);
if (error == 0) {
fbp = NULL;
logfree = 0;
} else if (error != -ENOSPC || args->total != 0)
return error;
/*
* It's possible to get ENOSPC if there is no
* space reservation. In this case some one
* else will eventually get rid of this block.
*/
}
/* Log the free entry that changed, unless we got rid of it. */
if (logfree)
xfs_dir2_free_log_bests(args, fbp, findex, findex);
return 0;
}
/*
* Remove an entry from a node directory.
* This removes the leaf entry and the data entry,
* and updates the free block if necessary.
*/
static int /* error */
xfs_dir2_leafn_remove(
xfs_da_args_t *args, /* operation arguments */
struct xfs_buf *bp, /* leaf buffer */
int index, /* leaf entry index */
xfs_da_state_blk_t *dblk, /* data block */
int *rval) /* resulting block needs join */
{
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dir2_db_t db; /* data block number */
struct xfs_buf *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data block entry */
xfs_inode_t *dp; /* incore directory inode */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry */
int longest; /* longest data free entry */
int off; /* data block entry offset */
int needlog; /* need to log data header */
int needscan; /* need to rescan data frees */
xfs_trans_t *tp; /* transaction pointer */
struct xfs_dir2_data_free *bf; /* bestfree table */
struct xfs_dir3_icleaf_hdr leafhdr;
struct xfs_dir2_leaf_entry *ents;
trace_xfs_dir2_leafn_remove(args, index);
dp = args->dp;
tp = args->trans;
leaf = bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
/*
* Point to the entry we're removing.
*/
lep = &ents[index];
/*
* Extract the data block and offset from the entry.
*/
db = xfs_dir2_dataptr_to_db(args->geo, be32_to_cpu(lep->address));
ASSERT(dblk->blkno == db);
off = xfs_dir2_dataptr_to_off(args->geo, be32_to_cpu(lep->address));
ASSERT(dblk->index == off);
/*
* Kill the leaf entry by marking it stale.
* Log the leaf block changes.
*/
leafhdr.stale++;
dp->d_ops->leaf_hdr_to_disk(leaf, &leafhdr);
xfs_dir3_leaf_log_header(args, bp);
lep->address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);
xfs_dir3_leaf_log_ents(args, bp, index, index);
/*
* Make the data entry free. Keep track of the longest freespace
* in the data block in case it changes.
*/
dbp = dblk->bp;
hdr = dbp->b_addr;
dep = (xfs_dir2_data_entry_t *)((char *)hdr + off);
bf = dp->d_ops->data_bestfree_p(hdr);
longest = be16_to_cpu(bf[0].length);
needlog = needscan = 0;
xfs_dir2_data_make_free(args, dbp, off,
dp->d_ops->data_entsize(dep->namelen), &needlog, &needscan);
/*
* Rescan the data block freespaces for bestfree.
* Log the data block header if needed.
*/
if (needscan)
xfs_dir2_data_freescan(dp, hdr, &needlog);
if (needlog)
xfs_dir2_data_log_header(args, dbp);
xfs_dir3_data_check(dp, dbp);
/*
* If the longest data block freespace changes, need to update
* the corresponding freeblock entry.
*/
if (longest < be16_to_cpu(bf[0].length)) {
int error; /* error return value */
struct xfs_buf *fbp; /* freeblock buffer */
xfs_dir2_db_t fdb; /* freeblock block number */
int findex; /* index in freeblock entries */
xfs_dir2_free_t *free; /* freeblock structure */
/*
* Convert the data block number to a free block,
* read in the free block.
*/
fdb = dp->d_ops->db_to_fdb(args->geo, db);
error = xfs_dir2_free_read(tp, dp,
xfs_dir2_db_to_da(args->geo, fdb),
&fbp);
if (error)
return error;
free = fbp->b_addr;
#ifdef DEBUG
{
struct xfs_dir3_icfree_hdr freehdr;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
ASSERT(freehdr.firstdb == dp->d_ops->free_max_bests(args->geo) *
(fdb - xfs_dir2_byte_to_db(args->geo,
XFS_DIR2_FREE_OFFSET)));
}
#endif
/*
* Calculate which entry we need to fix.
*/
findex = dp->d_ops->db_to_fdindex(args->geo, db);
longest = be16_to_cpu(bf[0].length);
/*
* If the data block is now empty we can get rid of it
* (usually).
*/
if (longest == args->geo->blksize -
dp->d_ops->data_entry_offset) {
/*
* Try to punch out the data block.
*/
error = xfs_dir2_shrink_inode(args, db, dbp);
if (error == 0) {
dblk->bp = NULL;
hdr = NULL;
}
/*
* We can get ENOSPC if there's no space reservation.
* In this case just drop the buffer and some one else
* will eventually get rid of the empty block.
*/
else if (!(error == -ENOSPC && args->total == 0))
return error;
}
/*
* If we got rid of the data block, we can eliminate that entry
* in the free block.
*/
error = xfs_dir3_data_block_free(args, hdr, free,
fdb, findex, fbp, longest);
if (error)
return error;
}
xfs_dir3_leaf_check(dp, bp);
/*
* Return indication of whether this leaf block is empty enough
* to justify trying to join it with a neighbor.
*/
*rval = (dp->d_ops->leaf_hdr_size +
(uint)sizeof(ents[0]) * (leafhdr.count - leafhdr.stale)) <
args->geo->magicpct;
return 0;
}
/*
* Split the leaf entries in the old block into old and new blocks.
*/
int /* error */
xfs_dir2_leafn_split(
xfs_da_state_t *state, /* btree cursor */
xfs_da_state_blk_t *oldblk, /* original block */
xfs_da_state_blk_t *newblk) /* newly created block */
{
xfs_da_args_t *args; /* operation arguments */
xfs_dablk_t blkno; /* new leaf block number */
int error; /* error return value */
struct xfs_inode *dp;
/*
* Allocate space for a new leaf node.
*/
args = state->args;
dp = args->dp;
ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC);
error = xfs_da_grow_inode(args, &blkno);
if (error) {
return error;
}
/*
* Initialize the new leaf block.
*/
error = xfs_dir3_leaf_get_buf(args, xfs_dir2_da_to_db(args->geo, blkno),
&newblk->bp, XFS_DIR2_LEAFN_MAGIC);
if (error)
return error;
newblk->blkno = blkno;
newblk->magic = XFS_DIR2_LEAFN_MAGIC;
/*
* Rebalance the entries across the two leaves, link the new
* block into the leaves.
*/
xfs_dir2_leafn_rebalance(state, oldblk, newblk);
error = xfs_da3_blk_link(state, oldblk, newblk);
if (error) {
return error;
}
/*
* Insert the new entry in the correct block.
*/
if (state->inleaf)
error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index);
else
error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index);
/*
* Update last hashval in each block since we added the name.
*/
oldblk->hashval = xfs_dir2_leafn_lasthash(dp, oldblk->bp, NULL);
newblk->hashval = xfs_dir2_leafn_lasthash(dp, newblk->bp, NULL);
xfs_dir3_leaf_check(dp, oldblk->bp);
xfs_dir3_leaf_check(dp, newblk->bp);
return error;
}
/*
* Check a leaf block and its neighbors to see if the block should be
* collapsed into one or the other neighbor. Always keep the block
* with the smaller block number.
* If the current block is over 50% full, don't try to join it, return 0.
* If the block is empty, fill in the state structure and return 2.
* If it can be collapsed, fill in the state structure and return 1.
* If nothing can be done, return 0.
*/
int /* error */
xfs_dir2_leafn_toosmall(
xfs_da_state_t *state, /* btree cursor */
int *action) /* resulting action to take */
{
xfs_da_state_blk_t *blk; /* leaf block */
xfs_dablk_t blkno; /* leaf block number */
struct xfs_buf *bp; /* leaf buffer */
int bytes; /* bytes in use */
int count; /* leaf live entry count */
int error; /* error return value */
int forward; /* sibling block direction */
int i; /* sibling counter */
xfs_dir2_leaf_t *leaf; /* leaf structure */
int rval; /* result from path_shift */
struct xfs_dir3_icleaf_hdr leafhdr;
struct xfs_dir2_leaf_entry *ents;
struct xfs_inode *dp = state->args->dp;
/*
* Check for the degenerate case of the block being over 50% full.
* If so, it's not worth even looking to see if we might be able
* to coalesce with a sibling.
*/
blk = &state->path.blk[state->path.active - 1];
leaf = blk->bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&leafhdr, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
xfs_dir3_leaf_check(dp, blk->bp);
count = leafhdr.count - leafhdr.stale;
bytes = dp->d_ops->leaf_hdr_size + count * sizeof(ents[0]);
if (bytes > (state->args->geo->blksize >> 1)) {
/*
* Blk over 50%, don't try to join.
*/
*action = 0;
return 0;
}
/*
* Check for the degenerate case of the block being empty.
* If the block is empty, we'll simply delete it, no need to
* coalesce it with a sibling block. We choose (arbitrarily)
* to merge with the forward block unless it is NULL.
*/
if (count == 0) {
/*
* Make altpath point to the block we want to keep and
* path point to the block we want to drop (this one).
*/
forward = (leafhdr.forw != 0);
memcpy(&state->altpath, &state->path, sizeof(state->path));
error = xfs_da3_path_shift(state, &state->altpath, forward, 0,
&rval);
if (error)
return error;
*action = rval ? 2 : 0;
return 0;
}
/*
* Examine each sibling block to see if we can coalesce with
* at least 25% free space to spare. We need to figure out
* whether to merge with the forward or the backward block.
* We prefer coalescing with the lower numbered sibling so as
* to shrink a directory over time.
*/
forward = leafhdr.forw < leafhdr.back;
for (i = 0, bp = NULL; i < 2; forward = !forward, i++) {
struct xfs_dir3_icleaf_hdr hdr2;
blkno = forward ? leafhdr.forw : leafhdr.back;
if (blkno == 0)
continue;
/*
* Read the sibling leaf block.
*/
error = xfs_dir3_leafn_read(state->args->trans, dp,
blkno, -1, &bp);
if (error)
return error;
/*
* Count bytes in the two blocks combined.
*/
count = leafhdr.count - leafhdr.stale;
bytes = state->args->geo->blksize -
(state->args->geo->blksize >> 2);
leaf = bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&hdr2, leaf);
ents = dp->d_ops->leaf_ents_p(leaf);
count += hdr2.count - hdr2.stale;
bytes -= count * sizeof(ents[0]);
/*
* Fits with at least 25% to spare.
*/
if (bytes >= 0)
break;
xfs_trans_brelse(state->args->trans, bp);
}
/*
* Didn't like either block, give up.
*/
if (i >= 2) {
*action = 0;
return 0;
}
/*
* Make altpath point to the block we want to keep (the lower
* numbered block) and path point to the block we want to drop.
*/
memcpy(&state->altpath, &state->path, sizeof(state->path));
if (blkno < blk->blkno)
error = xfs_da3_path_shift(state, &state->altpath, forward, 0,
&rval);
else
error = xfs_da3_path_shift(state, &state->path, forward, 0,
&rval);
if (error) {
return error;
}
*action = rval ? 0 : 1;
return 0;
}
/*
* Move all the leaf entries from drop_blk to save_blk.
* This is done as part of a join operation.
*/
void
xfs_dir2_leafn_unbalance(
xfs_da_state_t *state, /* cursor */
xfs_da_state_blk_t *drop_blk, /* dead block */
xfs_da_state_blk_t *save_blk) /* surviving block */
{
xfs_da_args_t *args; /* operation arguments */
xfs_dir2_leaf_t *drop_leaf; /* dead leaf structure */
xfs_dir2_leaf_t *save_leaf; /* surviving leaf structure */
struct xfs_dir3_icleaf_hdr savehdr;
struct xfs_dir3_icleaf_hdr drophdr;
struct xfs_dir2_leaf_entry *sents;
struct xfs_dir2_leaf_entry *dents;
struct xfs_inode *dp = state->args->dp;
args = state->args;
ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC);
ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC);
drop_leaf = drop_blk->bp->b_addr;
save_leaf = save_blk->bp->b_addr;
dp->d_ops->leaf_hdr_from_disk(&savehdr, save_leaf);
dp->d_ops->leaf_hdr_from_disk(&drophdr, drop_leaf);
sents = dp->d_ops->leaf_ents_p(save_leaf);
dents = dp->d_ops->leaf_ents_p(drop_leaf);
/*
* If there are any stale leaf entries, take this opportunity
* to purge them.
*/
if (drophdr.stale)
xfs_dir3_leaf_compact(args, &drophdr, drop_blk->bp);
if (savehdr.stale)
xfs_dir3_leaf_compact(args, &savehdr, save_blk->bp);
/*
* Move the entries from drop to the appropriate end of save.
*/
drop_blk->hashval = be32_to_cpu(dents[drophdr.count - 1].hashval);
if (xfs_dir2_leafn_order(dp, save_blk->bp, drop_blk->bp))
xfs_dir3_leafn_moveents(args, drop_blk->bp, &drophdr, dents, 0,
save_blk->bp, &savehdr, sents, 0,
drophdr.count);
else
xfs_dir3_leafn_moveents(args, drop_blk->bp, &drophdr, dents, 0,
save_blk->bp, &savehdr, sents,
savehdr.count, drophdr.count);
save_blk->hashval = be32_to_cpu(sents[savehdr.count - 1].hashval);
/* log the changes made when moving the entries */
dp->d_ops->leaf_hdr_to_disk(save_leaf, &savehdr);
dp->d_ops->leaf_hdr_to_disk(drop_leaf, &drophdr);
xfs_dir3_leaf_log_header(args, save_blk->bp);
xfs_dir3_leaf_log_header(args, drop_blk->bp);
xfs_dir3_leaf_check(dp, save_blk->bp);
xfs_dir3_leaf_check(dp, drop_blk->bp);
}
/*
* Top-level node form directory addname routine.
*/
int /* error */
xfs_dir2_node_addname(
xfs_da_args_t *args) /* operation arguments */
{
xfs_da_state_blk_t *blk; /* leaf block for insert */
int error; /* error return value */
int rval; /* sub-return value */
xfs_da_state_t *state; /* btree cursor */
trace_xfs_dir2_node_addname(args);
/*
* Allocate and initialize the state (btree cursor).
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/*
* Look up the name. We're not supposed to find it, but
* this gives us the insertion point.
*/
error = xfs_da3_node_lookup_int(state, &rval);
if (error)
rval = error;
if (rval != -ENOENT) {
goto done;
}
/*
* Add the data entry to a data block.
* Extravalid is set to a freeblock found by lookup.
*/
rval = xfs_dir2_node_addname_int(args,
state->extravalid ? &state->extrablk : NULL);
if (rval) {
goto done;
}
blk = &state->path.blk[state->path.active - 1];
ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
/*
* Add the new leaf entry.
*/
rval = xfs_dir2_leafn_add(blk->bp, args, blk->index);
if (rval == 0) {
/*
* It worked, fix the hash values up the btree.
*/
if (!(args->op_flags & XFS_DA_OP_JUSTCHECK))
xfs_da3_fixhashpath(state, &state->path);
} else {
/*
* It didn't work, we need to split the leaf block.
*/
if (args->total == 0) {
ASSERT(rval == -ENOSPC);
goto done;
}
/*
* Split the leaf block and insert the new entry.
*/
rval = xfs_da3_split(state);
}
done:
xfs_da_state_free(state);
return rval;
}
/*
* Add the data entry for a node-format directory name addition.
* The leaf entry is added in xfs_dir2_leafn_add.
* We may enter with a freespace block that the lookup found.
*/
static int /* error */
xfs_dir2_node_addname_int(
xfs_da_args_t *args, /* operation arguments */
xfs_da_state_blk_t *fblk) /* optional freespace block */
{
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dir2_db_t dbno; /* data block number */
struct xfs_buf *dbp; /* data block buffer */
xfs_dir2_data_entry_t *dep; /* data entry pointer */
xfs_inode_t *dp; /* incore directory inode */
xfs_dir2_data_unused_t *dup; /* data unused entry pointer */
int error; /* error return value */
xfs_dir2_db_t fbno; /* freespace block number */
struct xfs_buf *fbp; /* freespace buffer */
int findex; /* freespace entry index */
xfs_dir2_free_t *free=NULL; /* freespace block structure */
xfs_dir2_db_t ifbno; /* initial freespace block no */
xfs_dir2_db_t lastfbno=0; /* highest freespace block no */
int length; /* length of the new entry */
int logfree; /* need to log free entry */
xfs_mount_t *mp; /* filesystem mount point */
int needlog; /* need to log data header */
int needscan; /* need to rescan data frees */
__be16 *tagp; /* data entry tag pointer */
xfs_trans_t *tp; /* transaction pointer */
__be16 *bests;
struct xfs_dir3_icfree_hdr freehdr;
struct xfs_dir2_data_free *bf;
dp = args->dp;
mp = dp->i_mount;
tp = args->trans;
length = dp->d_ops->data_entsize(args->namelen);
/*
* If we came in with a freespace block that means that lookup
* found an entry with our hash value. This is the freespace
* block for that data entry.
*/
if (fblk) {
fbp = fblk->bp;
/*
* Remember initial freespace block number.
*/
ifbno = fblk->blkno;
free = fbp->b_addr;
findex = fblk->index;
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
/*
* This means the free entry showed that the data block had
* space for our entry, so we remembered it.
* Use that data block.
*/
if (findex >= 0) {
ASSERT(findex < freehdr.nvalid);
ASSERT(be16_to_cpu(bests[findex]) != NULLDATAOFF);
ASSERT(be16_to_cpu(bests[findex]) >= length);
dbno = freehdr.firstdb + findex;
} else {
/*
* The data block looked at didn't have enough room.
* We'll start at the beginning of the freespace entries.
*/
dbno = -1;
findex = 0;
}
} else {
/*
* Didn't come in with a freespace block, so no data block.
*/
ifbno = dbno = -1;
fbp = NULL;
findex = 0;
}
/*
* If we don't have a data block yet, we're going to scan the
* freespace blocks looking for one. Figure out what the
* highest freespace block number is.
*/
if (dbno == -1) {
xfs_fileoff_t fo; /* freespace block number */
if ((error = xfs_bmap_last_offset(dp, &fo, XFS_DATA_FORK)))
return error;
lastfbno = xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)fo);
fbno = ifbno;
}
/*
* While we haven't identified a data block, search the freeblock
* data for a good data block. If we find a null freeblock entry,
* indicating a hole in the data blocks, remember that.
*/
while (dbno == -1) {
/*
* If we don't have a freeblock in hand, get the next one.
*/
if (fbp == NULL) {
/*
* Happens the first time through unless lookup gave
* us a freespace block to start with.
*/
if (++fbno == 0)
fbno = xfs_dir2_byte_to_db(args->geo,
XFS_DIR2_FREE_OFFSET);
/*
* If it's ifbno we already looked at it.
*/
if (fbno == ifbno)
fbno++;
/*
* If it's off the end we're done.
*/
if (fbno >= lastfbno)
break;
/*
* Read the block. There can be holes in the
* freespace blocks, so this might not succeed.
* This should be really rare, so there's no reason
* to avoid it.
*/
error = xfs_dir2_free_try_read(tp, dp,
xfs_dir2_db_to_da(args->geo, fbno),
&fbp);
if (error)
return error;
if (!fbp)
continue;
free = fbp->b_addr;
findex = 0;
}
/*
* Look at the current free entry. Is it good enough?
*
* The bests initialisation should be where the bufer is read in
* the above branch. But gcc is too stupid to realise that bests
* and the freehdr are actually initialised if they are placed
* there, so we have to do it here to avoid warnings. Blech.
*/
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
if (be16_to_cpu(bests[findex]) != NULLDATAOFF &&
be16_to_cpu(bests[findex]) >= length)
dbno = freehdr.firstdb + findex;
else {
/*
* Are we done with the freeblock?
*/
if (++findex == freehdr.nvalid) {
/*
* Drop the block.
*/
xfs_trans_brelse(tp, fbp);
fbp = NULL;
if (fblk && fblk->bp)
fblk->bp = NULL;
}
}
}
/*
* If we don't have a data block, we need to allocate one and make
* the freespace entries refer to it.
*/
if (unlikely(dbno == -1)) {
/*
* Not allowed to allocate, return failure.
*/
if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)
return -ENOSPC;
/*
* Allocate and initialize the new data block.
*/
if (unlikely((error = xfs_dir2_grow_inode(args,
XFS_DIR2_DATA_SPACE,
&dbno)) ||
(error = xfs_dir3_data_init(args, dbno, &dbp))))
return error;
/*
* If (somehow) we have a freespace block, get rid of it.
*/
if (fbp)
xfs_trans_brelse(tp, fbp);
if (fblk && fblk->bp)
fblk->bp = NULL;
/*
* Get the freespace block corresponding to the data block
* that was just allocated.
*/
fbno = dp->d_ops->db_to_fdb(args->geo, dbno);
error = xfs_dir2_free_try_read(tp, dp,
xfs_dir2_db_to_da(args->geo, fbno),
&fbp);
if (error)
return error;
/*
* If there wasn't a freespace block, the read will
* return a NULL fbp. Allocate and initialize a new one.
*/
if (!fbp) {
error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE,
&fbno);
if (error)
return error;
if (dp->d_ops->db_to_fdb(args->geo, dbno) != fbno) {
xfs_alert(mp,
"%s: dir ino %llu needed freesp block %lld for data block %lld, got %lld ifbno %llu lastfbno %d",
__func__, (unsigned long long)dp->i_ino,
(long long)dp->d_ops->db_to_fdb(
args->geo, dbno),
(long long)dbno, (long long)fbno,
(unsigned long long)ifbno, lastfbno);
if (fblk) {
xfs_alert(mp,
" fblk 0x%p blkno %llu index %d magic 0x%x",
fblk,
(unsigned long long)fblk->blkno,
fblk->index,
fblk->magic);
} else {
xfs_alert(mp, " ... fblk is NULL");
}
XFS_ERROR_REPORT("xfs_dir2_node_addname_int",
XFS_ERRLEVEL_LOW, mp);
return -EFSCORRUPTED;
}
/*
* Get a buffer for the new block.
*/
error = xfs_dir3_free_get_buf(args, fbno, &fbp);
if (error)
return error;
free = fbp->b_addr;
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
/*
* Remember the first slot as our empty slot.
*/
freehdr.firstdb =
(fbno - xfs_dir2_byte_to_db(args->geo,
XFS_DIR2_FREE_OFFSET)) *
dp->d_ops->free_max_bests(args->geo);
} else {
free = fbp->b_addr;
bests = dp->d_ops->free_bests_p(free);
dp->d_ops->free_hdr_from_disk(&freehdr, free);
}
/*
* Set the freespace block index from the data block number.
*/
findex = dp->d_ops->db_to_fdindex(args->geo, dbno);
/*
* If it's after the end of the current entries in the
* freespace block, extend that table.
*/
if (findex >= freehdr.nvalid) {
ASSERT(findex < dp->d_ops->free_max_bests(args->geo));
freehdr.nvalid = findex + 1;
/*
* Tag new entry so nused will go up.
*/
bests[findex] = cpu_to_be16(NULLDATAOFF);
}
/*
* If this entry was for an empty data block
* (this should always be true) then update the header.
*/
if (bests[findex] == cpu_to_be16(NULLDATAOFF)) {
freehdr.nused++;
dp->d_ops->free_hdr_to_disk(fbp->b_addr, &freehdr);
xfs_dir2_free_log_header(args, fbp);
}
/*
* Update the real value in the table.
* We haven't allocated the data entry yet so this will
* change again.
*/
hdr = dbp->b_addr;
bf = dp->d_ops->data_bestfree_p(hdr);
bests[findex] = bf[0].length;
logfree = 1;
}
/*
* We had a data block so we don't have to make a new one.
*/
else {
/*
* If just checking, we succeeded.
*/
if (args->op_flags & XFS_DA_OP_JUSTCHECK)
return 0;
/*
* Read the data block in.
*/
error = xfs_dir3_data_read(tp, dp,
xfs_dir2_db_to_da(args->geo, dbno),
-1, &dbp);
if (error)
return error;
hdr = dbp->b_addr;
bf = dp->d_ops->data_bestfree_p(hdr);
logfree = 0;
}
ASSERT(be16_to_cpu(bf[0].length) >= length);
/*
* Point to the existing unused space.
*/
dup = (xfs_dir2_data_unused_t *)
((char *)hdr + be16_to_cpu(bf[0].offset));
needscan = needlog = 0;
/*
* Mark the first part of the unused space, inuse for us.
*/
xfs_dir2_data_use_free(args, dbp, dup,
(xfs_dir2_data_aoff_t)((char *)dup - (char *)hdr), length,
&needlog, &needscan);
/*
* Fill in the new entry and log it.
*/
dep = (xfs_dir2_data_entry_t *)dup;
dep->inumber = cpu_to_be64(args->inumber);
dep->namelen = args->namelen;
memcpy(dep->name, args->name, dep->namelen);
dp->d_ops->data_put_ftype(dep, args->filetype);
tagp = dp->d_ops->data_entry_tag_p(dep);
*tagp = cpu_to_be16((char *)dep - (char *)hdr);
xfs_dir2_data_log_entry(args, dbp, dep);
/*
* Rescan the block for bestfree if needed.
*/
if (needscan)
xfs_dir2_data_freescan(dp, hdr, &needlog);
/*
* Log the data block header if needed.
*/
if (needlog)
xfs_dir2_data_log_header(args, dbp);
/*
* If the freespace entry is now wrong, update it.
*/
bests = dp->d_ops->free_bests_p(free); /* gcc is so stupid */
if (be16_to_cpu(bests[findex]) != be16_to_cpu(bf[0].length)) {
bests[findex] = bf[0].length;
logfree = 1;
}
/*
* Log the freespace entry if needed.
*/
if (logfree)
xfs_dir2_free_log_bests(args, fbp, findex, findex);
/*
* Return the data block and offset in args, then drop the data block.
*/
args->blkno = (xfs_dablk_t)dbno;
args->index = be16_to_cpu(*tagp);
return 0;
}
/*
* Lookup an entry in a node-format directory.
* All the real work happens in xfs_da3_node_lookup_int.
* The only real output is the inode number of the entry.
*/
int /* error */
xfs_dir2_node_lookup(
xfs_da_args_t *args) /* operation arguments */
{
int error; /* error return value */
int i; /* btree level */
int rval; /* operation return value */
xfs_da_state_t *state; /* btree cursor */
trace_xfs_dir2_node_lookup(args);
/*
* Allocate and initialize the btree cursor.
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/*
* Fill in the path to the entry in the cursor.
*/
error = xfs_da3_node_lookup_int(state, &rval);
if (error)
rval = error;
else if (rval == -ENOENT && args->cmpresult == XFS_CMP_CASE) {
/* If a CI match, dup the actual name and return -EEXIST */
xfs_dir2_data_entry_t *dep;
dep = (xfs_dir2_data_entry_t *)
((char *)state->extrablk.bp->b_addr +
state->extrablk.index);
rval = xfs_dir_cilookup_result(args, dep->name, dep->namelen);
}
/*
* Release the btree blocks and leaf block.
*/
for (i = 0; i < state->path.active; i++) {
xfs_trans_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
/*
* Release the data block if we have it.
*/
if (state->extravalid && state->extrablk.bp) {
xfs_trans_brelse(args->trans, state->extrablk.bp);
state->extrablk.bp = NULL;
}
xfs_da_state_free(state);
return rval;
}
/*
* Remove an entry from a node-format directory.
*/
int /* error */
xfs_dir2_node_removename(
struct xfs_da_args *args) /* operation arguments */
{
struct xfs_da_state_blk *blk; /* leaf block */
int error; /* error return value */
int rval; /* operation return value */
struct xfs_da_state *state; /* btree cursor */
trace_xfs_dir2_node_removename(args);
/*
* Allocate and initialize the btree cursor.
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/* Look up the entry we're deleting, set up the cursor. */
error = xfs_da3_node_lookup_int(state, &rval);
if (error)
goto out_free;
/* Didn't find it, upper layer screwed up. */
if (rval != -EEXIST) {
error = rval;
goto out_free;
}
blk = &state->path.blk[state->path.active - 1];
ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
ASSERT(state->extravalid);
/*
* Remove the leaf and data entries.
* Extrablk refers to the data block.
*/
error = xfs_dir2_leafn_remove(args, blk->bp, blk->index,
&state->extrablk, &rval);
if (error)
goto out_free;
/*
* Fix the hash values up the btree.
*/
xfs_da3_fixhashpath(state, &state->path);
/*
* If we need to join leaf blocks, do it.
*/
if (rval && state->path.active > 1)
error = xfs_da3_join(state);
/*
* If no errors so far, try conversion to leaf format.
*/
if (!error)
error = xfs_dir2_node_to_leaf(state);
out_free:
xfs_da_state_free(state);
return error;
}
/*
* Replace an entry's inode number in a node-format directory.
*/
int /* error */
xfs_dir2_node_replace(
xfs_da_args_t *args) /* operation arguments */
{
xfs_da_state_blk_t *blk; /* leaf block */
xfs_dir2_data_hdr_t *hdr; /* data block header */
xfs_dir2_data_entry_t *dep; /* data entry changed */
int error; /* error return value */
int i; /* btree level */
xfs_ino_t inum; /* new inode number */
int ftype; /* new file type */
xfs_dir2_leaf_t *leaf; /* leaf structure */
xfs_dir2_leaf_entry_t *lep; /* leaf entry being changed */
int rval; /* internal return value */
xfs_da_state_t *state; /* btree cursor */
trace_xfs_dir2_node_replace(args);
/*
* Allocate and initialize the btree cursor.
*/
state = xfs_da_state_alloc();
state->args = args;
state->mp = args->dp->i_mount;
/*
* We have to save new inode number and ftype since
* xfs_da3_node_lookup_int() is going to overwrite them
*/
inum = args->inumber;
ftype = args->filetype;
/*
* Lookup the entry to change in the btree.
*/
error = xfs_da3_node_lookup_int(state, &rval);
if (error) {
rval = error;
}
/*
* It should be found, since the vnodeops layer has looked it up
* and locked it. But paranoia is good.
*/
if (rval == -EEXIST) {
struct xfs_dir2_leaf_entry *ents;
/*
* Find the leaf entry.
*/
blk = &state->path.blk[state->path.active - 1];
ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
leaf = blk->bp->b_addr;
ents = args->dp->d_ops->leaf_ents_p(leaf);
lep = &ents[blk->index];
ASSERT(state->extravalid);
/*
* Point to the data entry.
*/
hdr = state->extrablk.bp->b_addr;
ASSERT(hdr->magic == cpu_to_be32(XFS_DIR2_DATA_MAGIC) ||
hdr->magic == cpu_to_be32(XFS_DIR3_DATA_MAGIC));
dep = (xfs_dir2_data_entry_t *)
((char *)hdr +
xfs_dir2_dataptr_to_off(args->geo,
be32_to_cpu(lep->address)));
ASSERT(inum != be64_to_cpu(dep->inumber));
/*
* Fill in the new inode number and log the entry.
*/
dep->inumber = cpu_to_be64(inum);
args->dp->d_ops->data_put_ftype(dep, ftype);
xfs_dir2_data_log_entry(args, state->extrablk.bp, dep);
rval = 0;
}
/*
* Didn't find it, and we're holding a data block. Drop it.
*/
else if (state->extravalid) {
xfs_trans_brelse(args->trans, state->extrablk.bp);
state->extrablk.bp = NULL;
}
/*
* Release all the buffers in the cursor.
*/
for (i = 0; i < state->path.active; i++) {
xfs_trans_brelse(args->trans, state->path.blk[i].bp);
state->path.blk[i].bp = NULL;
}
xfs_da_state_free(state);
return rval;
}
/*
* Trim off a trailing empty freespace block.
* Return (in rvalp) 1 if we did it, 0 if not.
*/
int /* error */
xfs_dir2_node_trim_free(
xfs_da_args_t *args, /* operation arguments */
xfs_fileoff_t fo, /* free block number */
int *rvalp) /* out: did something */
{
struct xfs_buf *bp; /* freespace buffer */
xfs_inode_t *dp; /* incore directory inode */
int error; /* error return code */
xfs_dir2_free_t *free; /* freespace structure */
xfs_trans_t *tp; /* transaction pointer */
struct xfs_dir3_icfree_hdr freehdr;
dp = args->dp;
tp = args->trans;
*rvalp = 0;
/*
* Read the freespace block.
*/
error = xfs_dir2_free_try_read(tp, dp, fo, &bp);
if (error)
return error;
/*
* There can be holes in freespace. If fo is a hole, there's
* nothing to do.
*/
if (!bp)
return 0;
free = bp->b_addr;
dp->d_ops->free_hdr_from_disk(&freehdr, free);
/*
* If there are used entries, there's nothing to do.
*/
if (freehdr.nused > 0) {
xfs_trans_brelse(tp, bp);
return 0;
}
/*
* Blow the block away.
*/
error = xfs_dir2_shrink_inode(args,
xfs_dir2_da_to_db(args->geo, (xfs_dablk_t)fo), bp);
if (error) {
/*
* Can't fail with ENOSPC since that only happens with no
* space reservation, when breaking up an extent into two
* pieces. This is the last block of an extent.
*/
ASSERT(error != -ENOSPC);
xfs_trans_brelse(tp, bp);
return error;
}
/*
* Return that we succeeded.
*/
*rvalp = 1;
return 0;
}
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